Updated September 2026. If the recent iOS 20 update caused your shared family calendars to disappear, your events are likely still safe in iCloud. This guide explains how to force your iPhone to resync the missing data, fix all-day event glitches, and prevent family schedules from dropping in the future.
Why shared calendars disappear after updates
When your iPhone updates to a new major release like iOS 20, the connection between the Apple Calendar app and the iCloud server can temporarily drop. Your events are not deleted. The device has simply stopped displaying them until the sync connection is refreshed.
How to check if your events are safe
Before changing any settings, verify that the data still exists online. Log into iCloud.com from a computer using your Apple ID and open the Calendar app. If your shared events are visible on the web, you only have a local sync issue on your phone, not permanent data loss.
Step 1: Force a manual calendar refresh
The fastest way to recover missing events is to force the Calendar app to fetch new data from iCloud. Open your iPhone Calendar app. Tap "Calendars" at the bottom of the screen. Swipe down from the middle of the screen until you see the loading spinner. This forces a manual sync.
Step 2: Check your sync timeframe settings
iOS 20 may have reset how far back your calendar syncs. Go to Settings, tap Apps, then tap Calendar. Select "Sync." If it is set to a specific timeframe like "Events 1 Month Back," change it to "All Events." Wait a few minutes and check your calendar again.
Step 3: Toggle iCloud calendar access
If refreshing does not work, reset the iCloud connection entirely. Go to Settings, tap your name, then tap iCloud. Select "See All" under Saved to iCloud, and tap "iCloud Calendar." Turn the toggle off, wait thirty seconds, and turn it back on. This clears the local cache.
Step 4: Fix missing all-day events
If only all-day events are missing from the shared calendar, a time zone mismatch is often the cause. Go to Settings, tap Calendar, and check "Time Zone Override." Ensure both people sharing the calendar have identical time zone settings. If it still fails, the original owner should stop sharing the calendar and send a new invite.
A more reliable way to share family schedules
iCloud shared calendars require constant manual management. When one person forgets to add an event, or an iOS update breaks the sync, the system fails. There is a quieter way to keep everyone on the same page alongside your personal calendar.
Nuet is an intelligent family organiser that runs in the background. Instead of relying on manual calendar sharing, Nuet connects directly to your school, work, and personal inboxes. It spots family logistics—like school events, club schedules, and appointments—and automatically organizes them into one unified view.
Unlike apps that rely on email forwarding, Nuet's connected inbox approach means both parents see the exact same picture without any extra steps. You do not have to forward emails, and you do not have to maintain shared iCloud calendars. If you are looking for a school calendar app that handles the logistics for you, Nuet is built for this.
Everything is quietly handled. Nothing slips.
Frequently Asked Questions
Will I lose my calendar events if I turn iCloud sync off and on?
No. Turning off iCloud Calendar sync in your iPhone settings only removes the events from your local device temporarily. Once you turn it back on, the events will download again from the iCloud server.
Why are only some shared calendar events missing after the update?
If timed events are showing up but all-day events are missing, this is usually caused by mismatched time zone settings between the two people sharing the calendar. Check that "Time Zone Override" is identical on both devices.
Do I need to re-invite my partner to the shared calendar?
You only need to re-invite someone if forcing a manual refresh and toggling the iCloud connection do not restore the missing events. Re-sharing the calendar should be your last troubleshooting step.
